/*
 * Copyright (c) 2008, University of Aarhus.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - Neither the name of the University of Aarhus nor the names
 *   of its contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author: Morten Tranberg Hansen <mth@cs.au.dk>
 * @date:   October 16 2008	
 * 
 */

package dk.sensobyg.network.tinyos;

import java.util.Date;
import java.util.LinkedList;

import org.apache.log4j.Logger;

import dk.sensobyg.base.SensorData;
import dk.sensobyg.base.AbstractMote;
import dk.sensobyg.meta.SensorType;

import java.util.List;

public class TinyOSMote extends AbstractMote {

	private transient static Logger log = Logger.getLogger("dk.sensobyg.tinyos.network.TinyOSMote");
	private static final int MOTE_TIME_TO_MILLISECONDS_MULTIPLIER = 1000;
	private static final int RECENT_LIST_MAX_SIZE = 10;
    
    private long zeroTime;
    private LinkedList<SerialDataMessage> recentList;
	
    public TinyOSMote(int moteid) {
    	super(moteid);
    	zeroTime = 0;
    	recentList = new LinkedList<SerialDataMessage>();
    }
    
    public List<SensorData> getData(SerialDataMessage message) {
    	List<SensorData> result = new LinkedList<SensorData>();
    	
    	if(seenBefore(message)) {
    		return result;
    	}
    	
    	if(zeroTime==0) {
    		//TODO: what if mote restarts? need to to something about that.
			zeroTime = (new Date()).getTime() - message.get_data_timestamp()*MOTE_TIME_TO_MILLISECONDS_MULTIPLIER;
		}
    	
    	long timestamp = zeroTime+message.get_data_timestamp()*MOTE_TIME_TO_MILLISECONDS_MULTIPLIER;
    	long data = message.get_data_data();
   		Sensor sensor = getSensor(message.get_data_data_type());
    	if(sensor!=null) {
    		result.add(new SensorData( sensor.getSensorId(), timestamp, data ));
    	} else {
    		log.error("No sensor with typeid." + message.get_data_data_type() + " found on mote " + moteid + ".");
    	}
    	
    	addToRecent(message);
    	
    	return result;
	}
    
    private boolean seenBefore(SerialDataMessage message) {
    	for(SerialDataMessage recent : recentList) {
    		if(recent.get_origin()==message.get_origin() && recent.get_seqno()==message.get_seqno()) {
    			// TODO: log this
    			log.info("Message seen before.");
    			return true;
    		}
    	}
    	return false;
    }
    
    private void addToRecent(SerialDataMessage message) {
    	recentList.add(message);
    	while(recentList.size()>RECENT_LIST_MAX_SIZE) {
    		recentList.removeFirst();
    	}	
    }
    
    @Override
    public boolean equals(Object o) {
    	if(o==null) return false;
    	if(o.getClass()!=this.getClass()) return false;
    	return ((TinyOSMote)o).getMoteId()==this.getMoteId();
    }

}
